Prestressed tensioning anchor for metal bellows used in prestressed concrete + Prestressed bellows 80mm/M15-10 holes

Prestressed galvanized bellows is a type of metal conduit used in prestressed concrete structures, primarily to protect prestressed tendons (such as steel strands or rebars) and provide a grouting channel. Its corrugated structure enhances flexibility, while the galvanized treatment improves corrosion resistance.

2. Applications Widely used in prestressed concrete projects such as bridges, buildings, tunnels, dams, etc., to ensure the durability of prestressed tendons and the overall performance of the structure.

II. Structure and Material

1. Structure

• Corrugated Shape: Typically spiral or annular corrugations, enhancing flexibility and compressive resistance.
• Connection Method: Connected via sleeving, welding, or specialized joints to ensure sealing and continuity.

2. Material

• Base Material: High-quality low-carbon steel or stainless steel.
• Coating: Hot-dip galvanized or electro-galvanized to improve corrosion resistance.

III. Performance Characteristics

1. High Strength and Durability

• Capable of withstanding various loads during construction and use, ensuring the safety of prestressed tendons.

2. Good Flexibility

• The corrugated structure provides excellent bending performance, adapting to complex construction environments.

3. Excellent Corrosion Resistance

• The galvanized layer effectively prevents rust, extending the service life.

4. Easy Installation

• Lightweight and easy to cut, bend, and connect, simplifying the construction process.

5. Good Sealing

• Ensures smooth passage of grouting materials and prevents leakage.

IV. Technical Parameters

1. Specifications

• Diameter: Common diameter range from 50mm to 150mm, customizable as per requirements.
• Wall Thickness: Typically 0.3mm to 1.5mm, affecting its strength and durability.

2. Standards

• Complies with national and industry standards such as GB/T 19647, JT/T 529, etc.

V. Construction Application

1. Construction Preparation

• Material Inspection: Ensure the bellows specifications and materials meet design requirements.
• Equipment Preparation: Prepare cutting, bending, and connecting tools.

2. Installation Steps

• Positioning: Position the bellows according to the design drawings.
• Cutting and Bending: Cut and bend the bellows as per actual needs.
• Connection: Connect the bellows using sleeving, welding, or specialized joints to ensure sealing.
• Fixing: Use brackets or ties to secure the bellows and prevent displacement.

3. Grouting

• Preparation: Ensure the bellows are unobstructed.
• Grouting Material: Prepare cement slurry or other grouting materials as per design requirements.
• Grouting Process: Grout from the low end to the high end to ensure no bubbles or voids.

4. Quality Control

• Installation Accuracy: Ensure the position, height, and slope of the bellows meet design requirements.
• Sealing Check: Inspect the sealing at connections to prevent grout leakage.
• Grouting Quality: Ensure the grouting is dense and free of voids.

• Anchor Product Introduction and Construction Details

  I. Anchor Product Introduction

  1. Definition and Application Anchors are key components in prestressed engineering, used to anchor prestressed tendons, ensuring effective transfer of prestress to the concrete structure. Widely used in bridges, buildings, tunnels, and other projects.

  2. Main Types

  • Wedge-Type Anchors: Such as JM, XM, QM, etc., suitable for single or multiple steel strands.
  • Bearing-Type Anchors: Such as DM, LM, etc., commonly used in large-tonnage prestressed projects.
  • Cone-Socket Anchors: Such as K, H types, mainly used for wire bundles.
  • Bond-Type Anchors: Such as extrusion anchors, button-head anchors, suitable for end fixing.